<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>

      <!-- 表格占位 -->
      <tree-table
        class="treeTable"
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
      >
        <!--  是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            style="color: lightgreen"
            v-if="scope.row.cat_deleted === false"
          ></i>
          <i class="el-icon-error" style="color: red" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            type="success"
            size="mini"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini"
            >编辑</el-button
          >
          <el-button type="danger" icon="el-icon-delete" size="mini"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[2, 4, 6, 10]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        ref="addCateFormRef"
        :rules="addCateFormRelues"
        :model="addCateForm"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children',
            }"
            @change="parentCateChanged"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //选中的父级分类id数组
      selectedKeys: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //父级分类的数据列表
      parentCateList: [],
      //添加分类表单的要争规则对象
      addCateFormRelues: {
        cat_name: [
          {
            required: true,
            message: "请输入分类名称",
            trigger: "blur",
          },
        ],
      },

      //添加分类的表单数据对象
      addCateForm: {
        // 默认添加分类的等级是一级分类
        cat_level: 0,
        // 父级分类的id
        cat_pid: 0,
        // 将要添加分类的名称
        cat_name: "",
      },
      // 添加分类的对话框的显示与隐藏
      addCateDialogVisible: false,
      // 为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          //将当前列定义为模板列
          type: "template",
          //标识当前这一列使用模板名称
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },

        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      // 总数据条数
      total: 0,
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      // 商品分类的数据列表，默认空值
      catelist: [],
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //监听对话框的关闭事件，重置表单数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    },
    // 点击按钮 添加新的分类
    addCate() {
     this.$refs.addCateFormRef.validate( async valid =>{
       if(!valid) return
      const { data:res} = await this.$http.post('categories',this.addCateForm)
      if(res.meta.status !== 201){
        return this.$message.error('添加分类失败！')
      }
      this.$message.success('添加分类成功！')
      this.getCateList()
      this.addCateDialogVisible =false
     })
    },
    //选择项发生变化触发
    parentCateChanged() {
      // 如果selectedKeys数组中的length大于0
      //证明选中的是父级分类，反之就说明没有选中任何父级分类
      if (this.selectedKeys.length > 0) {
        //最后一项的索引的值
        //父级分类的id
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ];
        // 为当前分类的等级赋值
        this.addCateForm.cat_level = this.selectedKeys.length;
        return;
      } else {
        if (this.selectedKeys.length > 0) {
          //最后一项的索引的值
          //父级分类的id
          this.addCateForm.cat_pid = 0;
          // 为当前分类的等级赋值
          this.addCateForm.cat_level = 0;
        }
      }
    },
    //获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类失败！");
      }
      this.parentCateList = res.data;
    },
    showAddCateDialog() {
      // 先获取父级分类的数据列表
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    // 监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }
      this.$message.success("获取商品分类成功！");
      // 把数据列表赋值给catelist
      this.catelist = res.data.result;
      this.total = res.data.total;
    },
  },
};
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
</style>